the hubby's got a nice wide lens for his 10D that i also use on my Canon Rebel film camera ... its one of his favorites (he gets territorial with it when i want to use it ) ... but i'll let him jump in and elaborate on the specifics

The issue with wide lenses on the 10D is the magnification factor of x1.6.
To get something similar to a 24mm which is fairly wide IMO, you'll need
a 15mm for the 10D. It will burn a decent hole in your pocket...

I settled for a Sigma 15-30mm f3.5-f4.5 zoom lens... still, it was close to
$500. Image quality is good, AF is noisy as hell and the lens is very heavy.

I would go with Sigma. In fact I have, ordered a Sigma 20-40mm f2.8 last week for B&H, should arrive Tuesday. I know that a lot of $$$$$$$, but the lens should last me a like time I hope. Have been using a Sigma 28-70mm f2.8 as my prime lens but found it to be a little long on the D10 when close to the subject, first went with Sigma back in the Canon AE1P days because I read that they where the EOM supplier for Canon lens (back in 1987) and they were cheaper. Sigma has a few nice WA zoom lenses in the 400-650 USD range